All Tables

Table 1: Atmospheric parameters and distance determined from IUE spectra, using pure He models (He) and He contaminated with a small amount of H (He/H) models. An asterisk indicates a DBA star, for which our determinations are not adequate.
Table 2: Distance determined from distance modulus (Cols. 2-3) using IUE $T_{{\rm eff}}$ and $\log g$ , compared to absolute magnitude models and available V magnitudes. We used both pure He models (He) and He contaminated with a small amount of H (He/H) models. The last 2 columns are the distances after cross correlating these values and the spectroscopic distances (see values in Table 1).
Table 3: Using the distance determined by parallax measurements (second column), we study the best agreement with our fits, deriving the atmosphere composition (third column).
Table 4: Atmospheric parameter determinations from UV spectra in comparison to those derived by Beauchamp et al. (1999) using optical spectra. The last column shows the best agreement in atmosphere composition using both independent determinations.
Table 5: Journal of observations. $\Delta T$ is the length of the corresponding observing run.
Table 6: Variability classification of the DB stars in our sample. The V is used for variables, NV for non-variables and NO for not observed for variability.